Although the Guam Ko'ko' Half Marathon is a cheerful event, it also supports a very serious cause. GVB and race organizers work closely with the Department of Agriculture, Division of Aquatic and Wildlife Resources to raise awareness for Guam's territorial bird, also known as the Guam rail or ko'ko' bird, a flightless bird endemic to Guam.

The ko'ko' bird's numbers have been reduced to near extinction by the brown tree snake, pesticides, and other detractors. In 1995, one hundred ko'ko' birds were released on Rota, just north of Guam, where there are no snakes in an effort to save them from extinction.

The Guam rail also thrives in 17 zoos throughout the U.S., but the most exciting news is that the ko'ko' has been re-released into the wild with successful reproduction back in November 2010 on Cocos Island, located off the coast of Guam. It is these efforts that GVB will continue supporting through the net proceeds of the Guam Ko'ko' Half Marathon.

Che'lu' is the official mascot for the Guam Rail and will be found interacting with children, big and small, to heighten their knowledge of the ko'ko' bird.